ASTM D6409-99

Standard Practice for Color Tests with Sheepskin Skiver

SCOPE
1.1 This practice covers making color tests of all types of vegetable tanning extracts and of vegetable tanning materials to determine the color imparted to tanned skins.
1.2 The values given in SI units are to be regarded as the standard. The inch-pound units given in parentheses are for information only.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 09-May-1999
• ICS: 59.140.10 - Processes and auxiliary materials
• Technical Committee: D31 - Leather
• Drafting Committee: D31.01 - Vegetable Leather

Relations

• Replaced By: ASTM D6409-99(2004) - Standard Practice for Color Tests with Sheepskin Skiver
• Effective Date: 01-Apr-2004
• Referred By: ASTM D4899-99(2020) - Standard Practice for Analysis of Vegetable Tanning Materials—General
• Effective Date: 10-May-1999

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D 6409 – 99
Standard Practice for
Color Tests with Sheepskin Skiver
This standard is issued under the fixed designation D 6409; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope 3.1.4 tannin—an astringent substance found in the various
parts of plants such as bark, wood, leaves, nuts, fruits, roots,
1.1 This practice covers making color tests of all types of
etc.
vegetable tanning extracts and of vegetable tanning materials
3.1.5 vegetable tannins—mixtures of substances (natural
to determine the color imparted to tanned skins.
products) obtained from plant tissues by water extraction
1.2 The values given in SI units are to be regarded as the
which have the chemical and physical properties necessary to
standard. The inch-pound units given in parentheses are for
convert animal hides and skins into leather.
information only.
1.3 This standard does not purport to address all of the
4. Summary of Practice
safety concerns, if any, associated with its use. It is the
4.1 A specimen of pickled skiver is tanned with a sample of
responsibility of the user of this standard to establish appro-
vegetable tanning liquor in order to determine the color which
priate safety and health practices and determine the applica-
will be imparted to a clear, clean hide or skin that is tanned
bility of regulatory limitations prior to use.
with this tanning liquor.
2. Referenced Documents
5. Significance and Use
2.1 ASTM Standards:
2 5.1 This practice provides a standard procedure for compar-
D 1517 Definitions of Terms Relating to Leather
ing the color of leather tanned with different tanning extracts or
D 4901 Practice for Preparation of Solution of Liquid Veg-
2 mixtures of extracts or for monitoring the color consistency of
etable Tannin Extracts
tannery liquors.
D 4905 Practice for Preparation of Solution of Solid, Pasty,
and Powdered Vegetable Tannin Extracts
6. Apparatus and Reagents
D 6405 Practice for Extraction of Tannins from Raw and
6.1 Pickled Sheepskin Skiver, specially and consistently
Spent Materials
selected for the color test.
2.2 ALCA Methods:
6.2 Borax, commercial grade such as may be used in a
A40 Color Tests with Sheepskin Skiver
tannery.
6.3 Containers, 10 and 3 L capacity and made of suitable
3. Terminology
material to be resistant to the chemicals and materials used in
3.1 Definitions:
the tanning procedure employed by this practice.
3.1.1 For definitions of general leather and tanning terms
6.4 Acetic Acid, glacial, commercial grade.
used in this practice refer to Definitions D 1517.
6.5 Sodium Acetate, crystal, commercial grade.
3.1.2 pickled skiver—a sheepskin skiver that has been
6.6 Sodium Chloride, crystal, commercial grade.
pickled in a solution of salt and sulfuric acid.
6.7 Shake Bottles, 0.95 L (32 oz), with rubber stoppers. The
3.1.3 sheepskin skiver—the grain split of a de-wooled
bottles shall be approximately 21.6 cm (8.5 in.) overall height
sheepskin. A pickled skiver is used for this test.
and 8.9 cm (3.5 in.) diameter. One quart canning jars (Mason-
type) with plastic screw-on lids work well.
This practice is under the jurisdiction of ASTM Committee D-31 on Leather
6.8 Shaking Machine, rotating type, equipped to hold 0.95 L
and is the direct responsibility of Subcommittee D31.01 on Vegetable Leather. This
(32 oz) bottles for end-over-end agitation of hide powder and
test method has been adapted from and is a replacement for Method A40 of the
analytical solution. The speed of rotation shall be 606 2 rpm,
Official Methods of the American Leather Chemists Association.
Current edition approved May 10, 1999. Published August 1999.
and the machine shall be so constructed that the side of the
Annual Book of ASTM Standards, Vol 15.04.
shake bottle adjacent to the rotating shaft shall be not less than
Official Methods of the American Leather Chemists Association. Available
5.1 cm (2 in.) nor more than 7.6 cm (3 in.) from the center of
from the American Leather Chemists Association, University of Cincinnati, P.O.
Box 210014, Cincinnati, OH 45221-0014. the shaft.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D 6409
6.9 Flat Dish, 250 to 300 mL capacity; a photographic tray 9.2 Tanning Method I (Shake Method):
works well.
9.2.1 Add the washed skiver to the 400 mL liquor sample
6.10 Rubber Roller, photographic print roller works well.
(7.1) at 23 to 25°C, contained in a shake bottle. Immedia
...